I stumbled on this thread because I wondered exactly the same thing about the fresnel lens on my "new" Wista 45VX. Previously I used a plain ground glass on a Wisner Technical Field, so it's taking me a while to get used to the fresnel lens on the Wista. From another much older post about fresnel lenses on the forum, I was directed to this page on Ron Wisner's former site (which is still available via the Internet Archive). It helped me understand how fresnel lenses work. Recommended reading. http://web.archive.org/web/200805011...om/viewing.htm
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